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电路输入是4.5V 三节干电池， 经过LDO后给CC2541供电。现在问题是如何对4.5V输入电压进行时时检测，因为CC2541只有内部ADC检测，所以有什么方法可以解决。
你是要实时监测其过压，欠压等异常问题吗？若是，增加一个电压监测芯片即可，比如TPS3700
